Courier
I
-modem 17
Period Dial Modifier
The period (‘.’) dial modifier is used to send DTMF tones after the telephone
number is dialed. The period dial modifier can be used with the comma (',')
dial modifier to insert delay between the numbers as appropriate for the
application. A typical application for the period dial modifier is use with PBX
systems.
Example:
ATDT18479335200.980234
In this example, 18479335200 will be dialed using ISDN signaling, then
980234 will be dialed using in band DTMF signaling.
PCSDL vs. XMODEM
In certain situations, such as running under a multitasking OS such as
Microsoft Windows 95, you may experience difficulty performing a software
download using PCSDL. As a result, U.S. Robotics recommends using PCSDL
under
DOS only
or performing software download using the XMODEM file
transfer protocol as described in the
Courier I-modem Command Reference
in
section 17-2.
230 kbps DTE Rate Under Windows
®
If you are using a Windows® 95 terminal program, you will be unable to set
your transmission speed to 230 kbps.
230 kbps in Internal I-modems
The I-modem operates at 230 kbps when appropriate regardless of the
transmission speed setting.
Note:
The actual data rate for internal I-modems does not appear correctly in
Windows.
230 kbps in External I-modems
To take advantage of the 230 kbps data rate, you may need to purchase a high
speed (230 kbps) serial card.
Note:
Depending on the serial card you purchase, the actual data rate may not
appear correctly in Windows. Consult the serial card documentation if this
problem occurs.
